PARASITIC HYMENOPTERA. 39 



Gen. VIII. — Blacus. 

 Bracon, Fam. I. Heterocl. II. N. ab Ess. Berl. Mag. V. 18. 



Palpi maxillares 6-articulaii ; labiales 3-ariiculati : caput 

 parvulum subglobosum ; occipite marginato abdomen sub- 

 sessile ant vix subpetiolatum, venire carinato compresso, 

 ano truncalo ; aculeo lineari exerto: alarum anticarum 

 areola disci-antica contigua compieta ; cubitales duce ; 

 brachialis-posterior anteriore multo longior. 



Caput subglobosum, thorace non latius ideoque parvulum, quum hie 

 corapressus sit et solito angustior : occiput truncatum, marginatum ; 

 vertex amplus : ocelli in triangulum : frons ampla, declivis : 

 oculi parvi ovati, pilis subtilissimis raris consiti vel subglabri : 

 facies sub antennis tumida : clypeus linea impressa utrinque 

 foveolata ab epistomate discretus, sat amplus, transversus : 

 labrum transversum, lateribus rotundatum, aut semiovatum, 

 epipliaryngis ligula apicali attenuata prostante : mandibulae 

 cuneatae, curvatse, apice bidentes, forcipatae, cum labro os antice 

 claudentes : maxillae lobus membranaceus obtusus : palpi max- 

 illares 6-articulati ; articuli 1"^"^, 2''"^. breves ; 3*'^*. longior 

 crassior cultratus ; 4'*^^. adhuc longior linearis ; 6*"^. 4*°. brevior 

 5*°. vero paulo longior : labii lobus integer obtusus : palpi labiales 

 3-articulati ; articulus V°^^, obconicus ; 2"^"^ brevior, dilatatus 

 apice oblique truncatus ; S*^'^^. basi sensim attenuatus, s. sub- 

 clavatus : thorax oblongus compressus : mesothoracis sulculi 

 ordinarii ante scutellum conniventes : abdomen circiter thoracis 

 longitudine, illo antice multo angustius, postice vel sensim incras- 

 satum vel compressum : venter compressus carinatus ; anus 

 truncatus : aculeus linearis exertus : maris forceps analis exertus : 

 segmentum imum^ oblongum, tuberculis inter basin et medium, ideo 

 subsessile aut vix subpetiolatum : alarum anticarum stigma dis- 

 tinctum ; areola disci-antica costse contigua ; radialis lata cultrata, 

 apicem alse fere attingens ; cubitales duae ; nervus recurrens prope 

 apicem l"""^. insertus ; areola brachialis-posterior ultra anteriorem 

 valde elongata, apice attenuata ; postica-disci parva angusta : 

 alarum posticarum areola brachialis-posterior oblonga angusta, g 

 anterioris longitudine, nervo recurrente apicis recto : nervus 

 recurrens exterior nuUus. 



Subgenera. 



cmari \9,feminee IT .... II. Blacus. 

 Antennarum articuli . ^^j^^.^^ ^ Ganychorus. 



